By Jeff
- **Feb 15**, 02:00 AM

Math
First-grade tobacco costs $30 per kilogram while second-grade tobacco costs $20 per kilogram. If a blend contains only first and second grade tobacco, what must be the percentage of second-grade tobacco so that the blend would cost $22 per kilogram?
A. 20%
B. 30%
C. 60%
D. 75%
E. 80%
Question...

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By Jeff
- **Feb 14**, 02:00 AM

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By Jeff
- **Feb 13**, 02:00 AM

Math
In the month of November, a company sold 3000 items of model A and 1000 items of model B. Items of model A accounted for 60% of the company's monthly sales while items of model B accounted for 40% of the monthly sales. If the...

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By Jeff
- **Feb 10**, 02:00 AM

Math
If 4 small boxes and 5 big boxes weigh the same as 11 small boxes and 2 big boxes, how much does one small box weigh?
(1) One big box weighs 1 kg more than one small box.
(2) The ratio of the weight of one small...

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By Jeff
- **Feb 9**, 02:00 AM

Math
If a car went the first third of the distance at 80 kmh, the second third at 24 kmh, and the last third at 48 kmh, what was the average speed of the car for the entire trip?
A. 36 kmh
B. 40 kmh
C. 42 kmh
D. 44...

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By Jeff
- **Feb 8**, 02:00 AM

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By Jeff
- **Feb 7**, 02:00 AM

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By Jeff
- **Feb 6**, 02:00 AM

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By Jeff
- **Feb 3**, 02:00 AM

Math
Jack's income in October was 25% greater than his income in September. Jack's income in November was 20% less than his income in October. If Jack earned $200 more in October than in September, what was Jack's aggregate income in autumn?
A. $1200
B. $1800
C. $2000
D. $2400
E....

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By Jeff
- **Feb 2**, 02:00 AM

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